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420 = 2 x 2×3×5×7 420 = 22 x 31 x51× 71 The required number of ways = (2 + 1) x (1 + 1) x (1+1)×(1+1) = 3 x 2 x 2×2 = 24
4567.89 - 567.89 - 678.89 = ?
√1369 + √1024 + √841 =(?)2 − 46
(23.95)2 – (25.006)2 + (8.0099)2 – (7.07)2 = ? - (14.990)2
12 × 6 + 24 – 36 of 5 + 160 = ?
(47.5 ÷ 9.5) × (78.5 ÷ 15.7) + 475 = ? + 15% of 150
[490 of 7 - (13)2 of 5] - 1228 = ?
1000÷ 250 = ( 3√? × √1444) ÷ ( 3√512 × √361)
