Ex 5.2, 14 - How many multiples of 4 lie between 10 and 250? - Divisible/ multiples

  1. Chapter 5 Class 10 Arithmetic Progressions
  2. Serial order wise

Transcript

Ex 5.2 ,14 How many multiples of 4 lie between 10 and 250? Multiple of 4 are 4, 8, 12, 16, …. So the series is 12, 16, 20, … 248 Since difference is same, it is an AP Here a = 12 , d = 4 Last term = an = 248 We need to find n an = a + (n – 1) d an = a + (n – 1) d 248 = 12 + (n – 1) 4 248 = 12 + n (4) – 1 × 4 248 = 12 + 4n – 4 248 – 12 + 4 = 4n 236 + 4 = 4n 240 = 4n n = 240/4 n = 60 So, 60 multiples of 4 lie between 10 and 250

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