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Q.

If  pth  term of an A.P. is 1q  and qth term of A.P. is 1p  then sum of the first p q terms is

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a

12(1+pq)

b

pqp+q

c

12(pq1)

d

p+qpq

answer is D.

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Detailed Solution

pth  term (ap)=a+(p1)d=1q(1)

qth  term (aq)=a+(q1)d=1p(2)

(1)(2)

(p1)d(q1)d=1q1p

(p1q+1)d=pqpq

(pq)d=pqpq

d=1pq

Put d=1pq  in (1)

a+(p1)(1pq)=1q

a=1q1q+1pq=1pq

Spq=pq2[2a+(pq1)d]

=pq2(2pq+(pq1)(1pq))

=1+12(pq1)

=12pq+112=12pq+12

Spq=12(pq+1)

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