1.

If 3 × 4 = 21; 4 × 5 = 36; 5 × 6 = 55, then find 6 × 7.1. 912. 673. 424. 78

Answer» Correct Answer - Option 4 : 78

3 × 4 = 21; 4 × 5 = 36; 5 × 6 = 55

See the pattern

3 × (3 + 4) = 21

⇒ 3 × 7 = 21

⇒ 21 = 21 (satisfied)

Similarly,

4 × 5 = 36

⇒ 4 × (4 + 5) = 36

⇒ 4 × 9 = 36

⇒ 36 = 36 (satisfied)

Similarly,

5 × 6 = 55

⇒ 5 × (5 + 6) = 55

⇒ 5 × 11 = 55

⇒ 55 = 55 (satisfied)

Similarly,

6 × 7

⇒ 6 × (6 + 7)

⇒ 6 × 13

∴ Required value is 78


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