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The subject of the sentence is "Understanding", which is singular. Therefore, the verb should also be singular, i.e., "has been", not "have been."The confusion arises because "particles" and "electrons" are plural, but they are part of the object of the sentence. The subject of the sentence is "Understanding" (singular), so the correct verb form is "has been."Thus, the error is in (4) where "has been" should be used instead of "have been.""Understanding how particles such as electrons travel vast distances in space or how they acquire ultra-high energy has been a long-standing puzzle in astrophysics.
Statements: B < W ≥ A ≥ X; N ≤ C < Q = X
Conclusions:
I. Q ≥ W
II. W > C
III. N < A
Statements: R < S > T; U < V ≤ S; R > P
Conclusions:
I. S > P
II. U < R
III. T < P
In the question, assuming the given statements to be true, find which of the following conclusion(s) among the three conclusions is/are definitely tru...
Statements: P * R, M & N, R $ M
Conclusions: a) P @ M b) P $ M
...Statements: A < B ≤ C, A > E, F ≤ B < D
Conclusions:
I. D > A
II. E < B
III. C > E
IV. D > C
Statements: T < U = S ≤ O, C > Y ≥ X, T > K = X
Conclusions
I. O > K
II. C < T
III. U > K
Statement: M > N ≥ O; M ≤ P = Q; R > N
Conclusion: I. N < Q II. R > M
Statements:
L ≤ J ≤ C = N; W ≥ X > L
Conclusions:
I. J ≤ X
II. X ˃ W
In which of the following expressions does the expression ‘L > B’ and ‘R < N’ is true?
Statements: 2 < 4 = 8 ≤ 6; 4 ≥ 9 = 7 ≥ 10
Conclusions: I. 6 > 10 II. 6 = 10