Math, asked by atulsharma62, 10 months ago



21. यदि एक AP के पाँच पद का पाँच गुना उसके सातवें पद के सात गुना के बराबर हो, तो दर्शाइए कि बारहवाँ पद शून्य होगा।
In an A.P, if five times the fifth term is equal to seven times the seventh term, then show that twelfth term is
Zero.​

Answers

Answered by Anonymous
1

Step-by-step explanation:

5*A(5) = 7* A(7)

5{a+4d} = 7{a+6d}

5a + 20d = 7a + 42d

2a + 22d = 0

2(a+11d) = 0

a + 11d = 0

अर्थात A(12) = 0

Similar questions