determinethe number of terms in the AP: 3,7,11.........407. also find its 20th term from the end.
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l = last term = 407
d= common difference = 7-3 = 4
therefore, 20th term from the end = 407 + (20-1)(-4). [ because nth term from the end = l+(n-1)(-d) ]
= 407+19(-4)
= 407-76
= 331
ankit8151:
Thanx for the right answer...
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mn.........................
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