Question

1+3+5+7+.....sum of first 25odd positive integers is​

Answer 1

Answer:

1+3+5+7+9+11+13+15+17+19+21+23+25+27+29+31+33+35+37+39+41+43+45+47+49 = 625

Step-by-step explanation:

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Answer 2

a = first term = 1

d = 3 -1 = 2

n = number of terms = 25

than , according to A.P 's formula

an = a + {n-1} × d

an = 1+ { 25-1} × 2

an = 49

first 25 ood positive number till 49

sn = n/2 ×{ a + an}

sn = 25/2 ×{1+49}

sn = 25× 25 = 625 answer..