Find the missing number.
$1, 6, 15, 28, 45, . . . . .$

56

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66

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57

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63

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Solution

The correct option is B $66$
$6 - 1 = 5$
$15 - 6 = 9$
$28 - 15 = 13$
$45 - 28 = 17$
Difference increases in terms of four.
Next difference would be of $17 + 4 = 21$
$45 + 21 = 66$
Hence, Option B is correct.

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