61.
If four numbers in A.P. are such that their sum is 50 and the greatest number is 4 times the least, then the numbers are

62.
If S1 is the sum of an arithmetic progression of ‘n’ odd number of terms and S2 is the sum of the terms of the series in odd places, then $$\frac{{{S_1}}}{{{S_2}}}$$

63.
If the first term of an A.P. is 2 and common difference is 4, then the sum of its 40 term is

64.
The nth term of an A.P., the sum of whose n terms is Sn, is

65.
The sum of first n odd natural numbers in

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