An ap 5,12,19 has 50 terms….. and last terms is
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[ An = A + ( n – 1 ) D ],, A1 – A2 = 12 – 5 = 7 ,, A50 = 5 +( 50 – 1 ) 7 ,,= 5 + 49 × 7 = 343 + 5 = 348 .. hence proved .. thank you
“348”. HoPe It HeLpS yOu??
a = 5 , d = a2 – a1 = 12 – 5 = 7 , n = 50 , an = ? Solve : a50 = a + (n – 1)d = 5 + (50-1)7 = 5 + (49)7 = 5 + 343 a50=348
A= 5 ,common difference =a2-a1. => 12 – 5 = 7. So the 50 terms is a50= 5+(50-1)7. a50=348