Let denote the sum of terms of an progression (A.P.) whose . term is and the common difference is . Let and for is always a/an...

(d) : is a product of 2 numbers for each value of and hence is composite....

Let V_{r} denote the sum of 1^{{st}{~}}r terms of an arithmetic progression (A.P.) whose 1^{{st}{~}} . term is r and the common difference is 2r - 1. Let T_{r} = V_{r + 1} - V_{r} and Q_{r} = T_{r + 1} - {T}_{r} for r = 1,2, T_{r} is always a/an: Sequence & Series (Mathematics)

Let

V_{r}

denote the sum of

1^{\text{st}\text{~}}r

terms of an\narithmetic progression (A.P.) whose

1^{\text{st}\text{~}}

. term is\n

r

and the common difference is

2r - 1

. Let\n

T_{r} = V_{r + 1} - V_{r}

and\n

Q_{r} = T_{r + 1} - {T}_{r}

for\n

r = 1,2,\ldots

T_{r}

is always a/an