Question
Amit has 7 friends whom he wishes to invite to a dinner.
Out of his 7 friends, 1 or more may accept the invitation. In how many different ways can Amit's 7 friends atend the party?Solution
There are 7 people he wishes to invite. Every friend has 2 choices either accept or decline the invitation. So, total ways = 2*2*2*2*2*2*2 =27 Now, we know 1 or more may accept the invitation(given). So, no person is coming to part = 1 way. So, required ways = 27 – 1 = 128 – 1 = 127
Find the simplified value of the given expression:
(125 - 75 ÷ 3 of 5) ÷ 2 + 4 of 12 ÷ 3 - 16 of 5 ÷ 20
1549.8 ÷ 8.2 + 65.6 × 55 = (? × 4) + (42 × 30.5)
420 ÷ 7 + 140 % of 20 + ? × 13 = 18 × 15
What will come in place of ‘?’ in the given expression :
? – (22 × 25 + 70% of 160) = 272
15 * 12 + 35% of 80 + 70% of 130 = ?
What is the value of (152+82) ÷17
(25.111 % of 200) × 26 ÷ 12.99 – 18.88 × 15.82 + 150.33% of 3√ 4917 = ? – 200
...12.5% of (100 + ?) = 40
(3984 ÷ 24) x (5862 ÷ 40) = ?
675 ÷ 15 + 225 – 18 × 6 = ?